I. Introduction
CAD technology emerged in industrialized countries in the 1960s. With the rapid development of computer hardware technology and manufacturing itself, the CAD software industry has also grown rapidly. In the early 1980s, the application of CAD technology began in China, which formed scale in the late 1980s. In the early 1990s, our factory began to apply CAD technology. In 1997, it began to enter the field of reverse engineering technology integrating CAD/CAM/CAE, CAPP technology and many other high-tech. Now CAD/CAM has become the most basic tool and method for enterprise design and manufacturing.
Second, the establishment of CAD / CAM system
Our factory is a manufacturer of high and low voltage electrical components and complete sets of equipment. Thousands of sets of various switches and switchgears are produced every year. The characteristics of the product are: fast variety update and short delivery time, among which sheet metal and stamping parts account for more than 80% of all parts of the product. With the development of application technology and the continuous expansion of production scale, the factory introduced Japanese CNC punching machines, Swiss laser cutting machines, welding robots, machining centers in the United States, and three-coordinate measurement during the “Eighth Five-Year Plan†and “Ninth Five-Year Plan†period. Many advanced processing equipment such as instruments have undergone large-scale technical transformation. In the design practice of products, we recognize that product design is an important part of determining product performance, quality, level and economic efficiency. Whether a product has competitiveness or not depends largely on the design of the product. All the excellent performances of today's advanced switchgear and switchgear are the world's advanced design technology, advanced modeling technology, advanced analytical technology, advanced processing technology, advanced manufacturing technology and new materials and new methods. To achieve. Because the switch design requires small volume and the mechanism operation is reliable and light, it has certain speciality in structural design and manufacturing technology. The formulation of the machining process depends on the previous selection design and structural design. In the face of fierce competition from many peer manufacturers, in order to speed up the pace of their own scientific and technological progress, accelerate the upgrading of products, improve the high-tech content of products, as early as the end of 1989, began to pay attention to the introduction of CAD technology in CAD technology, the cold die Auxiliary design, in 1992, introduced the "JDS computer automatic wiring" software from Xijiao University, which made the secondary wiring diagram of the switchgear realize the computer design, which laid a good foundation for the popularization and application of CAD technology in the future. At the end of 1996, our factory was researched, commissioned and systematically tested. In early 1997, we introduced the open CAD software from Huazhong University of Science and Technology. The first phase of the software and hardware equipment configuration investment of less than 200,000 yuan has begun to take shape, and after several months of application has achieved good results, with the application of deepening, the scope of application is also wider. Originally only used in design departments, today, from design, process to production and processing has been fully rolled out. So far, our factory has introduced more than 50 sets of open-eye CAD software four times, running on more than 60 microcomputers, which can be said to have a certain scale. At the beginning of 1998, we introduced UGII software from EDS Company of the United States and began to gradually transfer from 2D design to 3D design, which made our design level a big step forward. At present, our factory only has the technical port: 60 Lenovo 586 computers, one SGI workstation, two HPVectraXU, one HP650, one HP700 plotter, and six EPSON inkjet printers, with a total investment of more than 2 million yuan. All microcomputers are connected by NT network. SGI workstations are also connected to the microcomputer by network. FTP software is installed on the microcomputer, and the NC code data is processed in real time and post-processed by duplex mode. In the working area of ​​the CNC punching machine, the communication protocol of the CNC NC system is used for arching. The RS232C serial communication port of the NC machine is connected with the PC486. The data transmission adopts the half-duplex mode, which allows the NC and the PC to transmit in both directions through the line. We also carried out the CAD/CAM integration attempt, created the shape of the part on the UG, entered the UG CAM module to generate the .CLSF file, and then used the general post processing of the UG software to generate the .ptp file, using the SGI workstation network, The communication between PC network, PC and NC machine tool completes the integrated design from CAD to CAM.
Third, the application of CAD / CAM / CAE
1. Integration of 3D design and 2D design Since the end of 1996, our factory has fully promoted the application of 2D computer design and achieved remarkable results. First of all, the application of two-dimensional CAD improves the drawing speed, the graphics are convenient, and the picture is beautiful. From the beginning of our factory application of open CAD design, we attach great importance to the establishment of CAD database. In the design process, whether it is structural design, process design or mold design, there are many jobs that are the same or similar. For this part of the work, We call it "standard parts", using the powerful functions provided by the software, combined with China's national standards and the specific conditions of the unit, all of them into a "standard parts database", greatly reducing duplication of labor and allowing designers to work from the lock Liberated, there is more energy to engage in creative optimization of product structure design. At the same time of introducing the open CAD software, our factory has also carried out secondary development for the most applied sheet metal processing, and successfully realized the computer design and manufacturing integration of sheet metal processing. The self-designed and developed secondary winding calculation book of current transformer, KYN4 (A) 10F opposite bridge automatic generation module. It was rated as “Best Userâ€, “Typical User†and Provincial CAD Demonstration Enterprise of Huazhong University of Science and Technology. At present, all of our products are developed with CAD design, with a plot rate of over 98%, a penetration rate of 100%, and tens of thousands of 2D drawings. However, this step only completes the engineering of the drawing board, and generates a pattern on the plane, and cannot realize the three-dimensional shape layout and dynamic analysis. We believe that to improve the design level, we can create a three-dimensional mathematical model to create a three-dimensional deformation design by applying the existing two-dimensional design drawings, and generate a series of parts and drawings of the parts.
It is a creative work in itself to transform existing resources into a new resource through optimal combination. The integration of 2D and 3D is such a comprehensive technical application project. Each component object in the open CAD and UG system supports the OLE/COM interface standard. The open design software can generate a DXF format file, and the UG 3D software can also directly read the DXF file format, which makes 2D and Three-dimensional integration is possible.
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Cylinder Magnet,Permanent Magnet,Neodymium Magnet
Sunxal Magnetics Co., Ltd. , http://www.hlmagnets.com